Mechanical Characterization and Modeling of a Powder-In-Tube MgB2 Strand

被引：2

作者：

Lenoir, Gilles ^{[1
]}

Aubin, Veronique ^{[1
]}

机构：

[1] CentraleSupelec, UMR CNRS 8579, Lab Mech Struct & Mat, F-92295 Chatenay Malabry, France

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2017年 / 27卷 / 04期

关键词：

Mechanical behavior; MgB2; modeling; multiscale mechanical tests; superconducting strand;

D O I：

10.1109/TASC.2016.2629481

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The strain dependence of superconducting material is known to be responsible for the degradation of the electrical performance of cables. As such, their electrical optimization requires an understanding of their mechanical behavior. This paper introduces a method for elasto-plastic modeling of commercial MgB2 multi-filamentary strands manufactured by the ex situ powder-in-tube method. The model is based on a simplified representation of the structure, built using components' volume fractions and nanoindentation test data. Monotonic and cyclic tension-compression tests were performed on the strands before and after chemical dissolution of the Monel outer layer to provide a multiscale experimental database. These tests were used to identify the parameters of the kinematic and isotropic hardening laws of the elasto-plastic model. The model intends to be subsequently used to simulate the electrical behavior of cables and define guidelines for the manufacturing process, cabling process, and end-product operating condition.

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